Fixes #675

`on_treeview_changed` is triggered during `treebrowser_tree_store_iter_clear_nodes`, leading to a double-delete.

Consistent (as far as I can tell) reproduction steps: 1. Create a folder 2. Create two new files in folder 3. Delete second file You can view, comment on, or merge this pull request online at:

https://github.com/geany/geany-plugins/pull/1015

-- Commit Summary --

* TreeBrowser: Avoid double node clear

-- File Changes --

M treebrowser/src/treebrowser.c (3)

-- Patch Links --

https://github.com/geany/geany-plugins/pull/1015.patch https://github.com/geany/geany-plugins/pull/1015.diff