Array is more semantically appropriate.
For example 2 actions may have the same translations (error of a translator). With an object (or a map), only the second would be displayed, which is problematic to alert to the problem.
Additionally, handle the case where some GSettings keybinding values are empty.
* Let the user choose the directory.
* Rework of Files.Images.
* area.currentImage is now an ... image, not an index.
* Add 'switch-image-file-reverse' keybinding.
* Add image gicons (from thumbnails) in the submenu.
* Images are reset on drawing mode left or on images added from the clipboard.
Since the most drawing params can be changed via menu or shortcuts, remove default.css and user.css.
* Missing params like palettes, dash, grid, etc, are added to prefs.
* Add palette choice to menu and shortcuts.
* Some defaults like fonts, line width, etc, are no longer modifiable by the user.
All key events go through a hidden St Entry.
* Ibus inputs support.
* GS keyboard support, by moving the keyboard box above the drawing area.
* All convenience keybindings of a St Entry (cursor moves, delete, paste, select all ...).
* Add a writing action mode so some keybindings are disabled when writing (e.g. `Delete` and `Ctrl + A`).
* Draw a thin rectangle as text cursor instead of a text character, so moving the cursor is smoother.
Close#29, #34
Use `Main._findModal` instead of `Main.actionMode` as the criterion of the toggle direction.
Main.actionMode is not a safe criterion to know if the area is modal. For example, `Main.actionMode` is modified when toggling overview while drawing.
* Close menu before toggling modal (before because the menu changes `Main.actionMode`).
* Hide the helper and update the grid display when toggling modal.
* Signal `stop-drawing` -> `leave-drawing-mode` for consistence.
* `area.disable` -> area `destroy` event handler.
* `area.isInDrawingMode` -> `area.reactive`.
Keybinding to ungrab keyboard and mouse while drawing remains at the top.
To be aware that this create some problems with the shell (DnD #1 and maybe more ?).
related to #6, #9, #20, #24, #33
* `SCALE_PRESERVE` (preserve ratio)
* `SCALE` (vertical, horizontal or both)
There is a third transformation, `SCALE_ANGLE`, that is not used because it causes problems to the `elementFinder`. Probably a bug of Cairo.inStroke that do no consider scales.
* 'Shapes' -> 'Tools' ('Shapes' + 'Manipulations')
* 'TextState' -> 'TextStates'
* Rotation centers are now computed dynamically (when building Cairo or SVG paths).
* Text rotation center is now located at the beginning of the text.
* Text elements gain a 'lineIndex' attribute to retrieve the rotation center of the first line.
* Use a "drawOnYourScreen" subdir in the xdg user data dir
* Info item with the name of the last saved/open json file
* "Open drawing" sub menu with data dir content
* "Save drawing" sub menu with entry
* "Save", "Open previous" and "Open next" keybindings
* use var to export extensionJs.manager
* remove duplicated (old) buildPrefsWidget
* set OsdWindow.HIDE_TIMEOUT in a try/catch because HIDE_TIMEOUT is not exported with 'var'
* capture i in callbacks in for(){} (i is changing)
* add 3.24 version as supported
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