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appDisplay: Protect against source icon destruction

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When dragging icons out of a folder dialog, there is a very peculiar
combination of steps that may break GNOME Shell:

 1. Open an app folder dialog
 2. Start dragging an icon to outside the grid
 3. Wait until the popdown animation starts
 4. Before it finishes, drop the icon
 5. See the warnings / crash

That's caused by the source icon being destroyed after the delayed
move timer starts, and before it finishes.

Protect against the source icon being destroyed before the delayed
move timeout triggers by connecting to the 'destroy' signal and
removing the timeout on the callback. Use a single field, called
'_delayedMoveData', to store all data related to delayed moves.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1447
This commit is contained in:
Georges Basile Stavracas Neto 2020-09-24 18:57:56 -03:00 committed by Florian Müllner
parent aaff88a6bb
commit d04daf6a1c
1 changed files with 31 additions and 21 deletions
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46
js/ui/appDisplay.js
View File

@ -199,8 +199,7 @@ var BaseAppView = GObject.registerClass({
// Drag n' Drop
this._lastOvershoot = -1;
this._lastOvershootTimeoutId = 0;
this._delayedMoveId = 0;
this._targetDropPosition = null;
this._delayedMoveData = null;
this._dragBeginId = 0;
this._dragEndId = 0;
@ -355,29 +354,40 @@ var BaseAppView = GObject.registerClass({
return;
}
if (!this._targetDropPosition ||
this._targetDropPosition.page !== page ||
this._targetDropPosition.position !== position) {
if (!this._delayedMoveData ||
this._delayedMoveData.page !== page ||
this._delayedMoveData.position !== position) {
// Update the item with a small delay
this._removeDelayedMove();
this._targetDropPosition = { page, position };
this._delayedMoveId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
this._delayedMoveData = {
page,
position,
source,
destroyId: source.connect('destroy', () => this._removeDelayedMove()),
timeoutId: GLib.timeout_add(GLib.PRIORITY_DEFAULT,
DELAYED_MOVE_TIMEOUT, () => {
this._moveItem(source, page, position);
this._targetDropPosition = null;
this._delayedMoveId = 0;
this._delayedMoveData.timeoutId = 0;
this._removeDelayedMove();
return GLib.SOURCE_REMOVE;
});
}),
};
}
}
_removeDelayedMove() {
if (this._delayedMoveId > 0) {
GLib.source_remove(this._delayedMoveId);
this._delayedMoveId = 0;
}
this._targetDropPosition = null;
if (!this._delayedMoveData)
return;
const { source, destroyId, timeoutId } = this._delayedMoveData;
if (timeoutId > 0)
GLib.source_remove(timeoutId);
if (destroyId > 0)
source.disconnect(destroyId);
this._delayedMoveData = null;
}
_resetOvershoot() {
@ -495,8 +505,8 @@ var BaseAppView = GObject.registerClass({
return false;
// Dropped before the icon was moved
if (this._targetDropPosition) {
const { page, position } = this._targetDropPosition;
if (this._delayedMoveData) {
const { page, position } = this._delayedMoveData;
this._moveItem(source, page, position);
this._removeDelayedMove();