Problem Management is the seventh module made mobile‑friendly, after Tickets, Assets, Calendar, Knowledge, Service Status and Watchtower. Same hard rule: one @media (max-width: 768px) block, desktop byte‑identical.

🧰 Code‑level catalogue of the techniques: Mobile: Techniques & Tricks.

Shipped as #1181, commit 854e3532. LAYER 22.

viewport = 360   docScrollW = 872   CONTAINED = false
sidebar  = 250px          .pm-main = 110px

Two separate problems, and only one of them was the obvious one.

872px wide is the iOS reflow‑to‑desktop trap, and — exactly as with Watchtower — the cause was the shared header row rather than anything in this module. Opting in fixed it outright.

The 110px list did not move. A 250px fixed sidebar beside a flexible pane leaves the pane whatever is left, and on a 360px screen that is a third of the width for the actual content. The page was contained, scrollable, and useless.

🔑 This is the clearest demonstration yet that docScrollW === innerWidth is the floor, not the finish line. Every automated check passed on a screen showing a 110px column of problems.

It holds three things: Search, New problem, and the status filters. Stacked as‑is that is ~250px of a 640px screen before the first problem appears.

.pm-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;   /* the two buttons share a line */
    gap: 8px;
    border-right: none;
    border-bottom: 1px solid var(--border, #e5e7eb);
}
.pm-sidebar h3,
.pm-sidebar #pmStatusFilters { grid-column: 1 / -1; }   /* these span both */

A two‑column grid with selective spanning is a tidy way to say "these two side by side, everything else full width" without adding a wrapper element to the markup.

#pmStatusFilters {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
}
#pmStatusFilters::-webkit-scrollbar { display: none; }
.pm-filter { flex: 0 0 auto; white-space: nowrap; }

Same scrollbar‑hiding idiom as .detail-tabs, .sw-filter-tabs and the settings .tabs — the bar is redundant on touch and eats a row of height on a narrow desktop window.

Why not a <select>? Because each chip carries its count, and the counts are half the value of the control — "are there any open ones at all?" is answered without opening anything. A dropdown hides exactly the information you came for.

.pm-modal-content { width: 100%; max-width: none !important; margin: 0; border-radius: 0; min-height: 100%; }

LAYER 3 promotes every .modal-content to a full‑screen sheet — but this module has its own .pm-modal-content, so none of that reached it. Three dialogs (link incidents, link change, detect problems) stayed as 92%‑width centred boxes with a 40px margin.

🔑 Check the module's modal class before assuming LAYER 3 covers it. A module that rolled its own is invisible to a rule keyed on the shared name, and there is nothing in the measurements to tell you — a centred box on a phone is contained.

Three modules in a row shipped with no mobile.js at all, which makes a fourth feel like failure. It is not — the test is what the page actually does.

This module was already master‑detail: pmOpenDetail() hides #pmListView and shows #pmDetailView in the same pane. Nothing needed restructuring. The only fault was that the sidebar stayed on screen while you read a problem, spending ~140px of a 640px screen on controls for the list you had just left.

var openDetail = window.pmOpenDetail;
window.pmOpenDetail = function () {
    var out = openDetail.apply(this, arguments);
    Promise.resolve(out).then(function () {
        var dv = document.getElementById('pmDetailView');
        if (dv && dv.style.display !== 'none') setPane('detail');
    });
    return out;
};

Both functions are top‑level declarations, so they are properties of the global object and can be wrapped from mobile.js with no edit to problem-management.js — see Techniques §1.

Two details worth copying:

• Mark the pane only after the promise resolves. pmOpenDetail is async and bails on a failed fetch. Marking up front would leave the sidebar hidden behind an error toast, with the list underneath and no way back to it.
• The state is an attribute, the hiding is CSS. body[data-pm-pane="detail"] .pm-sidebar { display: none } sits inside the @media block, and the wrapper refuses to set the attribute unless mq.matches — so desktop never sees it even if the JS runs.

That last row matters. A parse harness that cannot fail proves nothing, so the same page was loaded with a deliberately broken script alongside: it reported Uncaught SyntaxError, which is what makes the clean result meaningful.

Driving all three states — not just the page as it loads — is the reason the modal fault was found at all. A page that renders one view at a time is one‑view verified.

• The AI "Detect problems" suggestions list ticket numbers as plain text. They come from a model rather than the database, so linking them needs a server‑side number→id resolve that would also quietly validate the model's output — see discussion #91. Not a mobile issue, but it shows up here.
• The detail view's field grid is two columns even at 360px (PRIORITY / ASSIGNED TO). It reads fine with short values; a long assignee name would be tight.

Ed found the History panel's What column running off the right-hand edge. Measuring the other two tables on the same page found the same fault in a quieter and worse form.

🔑 Overflow gets reported; crushing does not. The two that squeezed passed every automated check — contained, nothing uncontained, no overflow — while being less readable than the one that visibly broke.

All three became card feeds, by the rule now written up as Techniques §11: every one of them has a column holding prose (What, Subject, Title), and a sentence can be neither scrolled sideways nor squeezed into 82px.

History now reads the way the module's own notes already do — a quiet when · who line, then the change itself:

15/07/2026, 01:17:50 · Administrator
changed linked_incident to "LUN-779-88063"

Two details worth copying:

• The meta cells are display: inline, not a flex row. Flex blockifies its items, so a flex column cannot put two cells on one line. Plain inline on two adjacent cells does.
• :has(.pm-when) scopes the history-only rules. Three tables share the .pm-table class; that one class appears only on audit rows, so the markup needed no change at all to tell them apart.

⚠️ The empty state is a single <td colspan> — the first and last child of its row — so any rule keyed on either position swallows it. Asserted explicitly: "No change linked yet." still renders after the change.

Desktop control: display: table, table-header-group, table-row, table-cell, header row visible, four columns, at 1100px and 1400px.

• Mobile‑Friendly — the overview and the rollout state
• Mobile: Techniques & Tricks — the code‑level catalogue
• Problem Management — the module itself