QHash/QMap::keys() allocates a list of every key on each call, then
contains() searches it linearly - an accidental O(n) plus allocation
where a direct O(1) lookup was meant. 35 occurrences across 7 files,
found while profiling project load times (context: #553/#560).
The hot one is ElementPictureFactory::getPictures(), which runs once
per element instance on project load: on the 3399 KiB example project
(191 instances, 129 cache hits) the keys() detour cost 45 ms of the
1.34 s total - measured, not estimated; the fix reproducibly shaves
~35-45 ms off that load. The remaining call sites are UI paths
(search&replace, dynamic text model, undo commands) where the waste
scales with selection/model size.
No behavior change: for QHash/QMap, keys().contains(k) and
contains(k) are equivalent by definition.
(cherry picked from commit 0a7f8f072fa68de7c01a9fc134a4bc8e16d62062)
Add a message box to advise user that use a hdpi round factor can cause
strange render according to :
1 - the selected value
2 - the dpi of the screen
3 - Edit the project on another computer and/or screen who don't have
the same parameters as point 1 and 2.
- include Liberation-Fonts and osifont
(thanks elevatormind!)
- use "Liberation Sans" as default-font
- adjust License-Tab in About-Form
- Bugfix: When selecting a font, the current
font is highlighted in dialog
- adjust some whitespace and English comments
Introduced additional spinboxes in config-page for
setting min- and max-size of grid-dots separately for
diagram- and element-editor.
That assures maximal flexibility for setting the grids.
Don't want the grid-dots to change over zooming-levels?
Set min- and max-values to the same number.
Preset-values for all min-/max-values is "1".
If the adjustable range of 1 to 5 is not sufficient, it
can be easily adjusted. Only need feedback for this.
the path is set the first time the function is called.
Each other call will immediately return the previously setted path
instead of check again what path to return.
Tab stop definitions inserted in some dialogs, so that the order of tab-stops-moves corresponds as closely as possible to the fields' position in the window.
Dieter Mayer