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Pin rail row icons to the left edge instead of letting Qt centre them

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QStyledItemDelegate hands the style decorationAlignment = AlignHCenter |
AlignVCenter. For a row with a label that is invisible — the icon sits left of
the text either way — but every rail row loses its label when the rail
collapses to 54px, and a centred decoration then lands wherever the column
happens to leave room. _NavItemDelegate overrides it to AlignLeft, so the icon
is on the row's left padding regardless of column width, style or platform.

Honest limit: this was reported from the running app and I could not reproduce
it offscreen — sweeping the column width leaves the icon at a fixed x with or
without the delegate. What is verifiable is the instruction, and centring is
the only mechanism by which Qt can put a label-less row's icon anywhere but
the left. check_rail_align now asserts the flag itself, which fails (132) the
moment the delegate is removed, alongside the column sweep.

Settings follows the rows to their new inset (padding-left 7px → 4px). Its
label still sat 3px left of Dashboard's because a button leaves less air
between icon and label than a tree row does; a 19px icon box closes that to
1px, with the 16px glyph left-aligned inside it.

15/15 checkers pass, no flakes this run.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Nam Pham Dinh Thanh
2026-08-18 11:01:56 +09:00
co-authored by Claude Opus 5
parent d060d5679a
commit cb03bc1494
3 changed files with 90 additions and 9 deletions
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theme.py
+6 -2
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@@ -349,7 +349,7 @@ QToolTip {
/* Icons are drawn at text scale, not as decoration. */
QPushButton, QToolButton, QComboBox, QTabBar { qproperty-iconSize: 15px 15px; }
QTreeWidget#navrail { qproperty-iconSize: 16px 16px; }
QTreeWidget#navrail { qproperty-iconSize: 22px 16px; }
/* ---- shell ------------------------------------------------------------ */
QWidget#topbar { background: $bg; border: none; border-bottom: 1px solid $border; }
@@ -471,7 +471,11 @@ QComboBox#navProjectPick {
}
QPushButton#navSettingsBtn {
background: transparent; border: none; color: $text_muted;
padding: 6px 8px 6px 7px; text-align: left; border-radius: ${radius}px;
padding: 6px 8px 6px 4px; text-align: left; border-radius: ${radius}px;
/* A button leaves less air between icon and label than a tree row
does, so the word sat 3px left of Dashboard's. Widening the icon
box (the glyph stays 16px, left-aligned) closes the gap. */
qproperty-iconSize: 19px 16px;
/* No side margin: Settings reads as one more row under Dashboard/Giám sát,
so its icon has to start on their x. A 6px margin put it at 14 — near
enough the middle of the collapsed 54px rail to look centred. */