Symbols dialog: when docked, any drag already inserts symbol

[Hachmann]

Inkscape 0.91 and 0.92

When dragging a symbol in the docked symbols dialog, away from its current position, but not outside the boundaries of the symbols dialog, it is inserted in the middle of the current viewport when the mouse button is released.

When doing the same from a floating symbols dialog, the behaviour is as expected: the symbol just slides back to its original position in the dialog.

A symbol that is not dragged onto the drawing should not be inserted into the drawing.

[su_v (suv-lp)]

Based on tests with archived builds (on OS X):
- not reproduced with lp:inkscape 11783 <= rev <= 11878,
- reproduced with lp:inkscape rev >= 11882,
- reproduced with Inkscape 0.91 r13725,
- reproduced with Inkscape 0.92.0 r15299,
- reproduced with lp:inkscape/0.92.x rev 15315;
it seems that this behavior is present as described since the initial implementation of the drag&drop support to insert a symbol into the current document:
https://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/changes/11882

Rev 11880: Fix for bug #1079971 : Symbol dialog : Drag & Drop to the canvas
https://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/11880

[su_v (suv-lp)]

Reproduced with Inkscape 0.92+devel r15415 on Ubuntu 14.04.5 LTS.

[Nathan Lee (nathan.lee)]

Closing as part of bug migration to GitLab. Tracked in https://gitlab.com/inkscape/inkscape/-/issues/1197 and fixed by 58c8b25db30516ad62de19d62a56475cd8ea2345 (1.1-dev) fix #1197 Ignore drag&drop outside canvas