#1260 Changing language exits editing

[Iaroslav Voitovych]

Discovered at: Windows 10

Prerequisites: More than one input language should be installed.

Steps:
1. Start editing any node's text
2. Press LeftShift-LeftAlt
3. Continue typing

Expected result: You continue typing in another language

Actual result: Node-editing exits at pressing LeftShift-LeftAlt, continuing typing deletes previous text in the node.

Note: Inverse sequence variant LeftAlt-LeftShift works OK.