RFR: 8275033: Drag and drop a file produces NullPointerException Cannot read field "dragboard"

[Andy Goryachev]

On Thu, 19 Jan 2023 16:16:18 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

> When running on Wayland the `GDK_DRAG_LEAVE` is sent just after `GDK_DROP_START`. The leave event causes java to set `dragGesture` to `null`. On Xorg this event is not sent. 
> 
> The fix just ignores the leave event if a drop occurred.

Tested with FxDock on Xorg - no ill effects.

modules/javafx.graphics/src/main/native-glass/gtk/glass_dnd.cpp line 141:

> 139:     jobjectArray mimes;
> 140:     gint dx, dy;
> 141: } enter_ctx = {NULL, FALSE, FALSE, NULL, 0, 0};

it's funny how it's initialized here and also in reset_enter_ctx(), and just by coincidence both produce the same result.  This will break if initial values are other than NULL, 0, FALSE.

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Marked as reviewed by angorya (Committer).

PR: https://git.openjdk.org/jfx/pull/1005