Log Message:
Update geany to 1.26.

Provided by David H. Gutteridge in PR 50451.

Change log:

    General
    * New plugin API (Thomas Martitz, PR#469).
    * Add support for "proxy" plugins (Thomas Martitz, PR#629).

    Bug fixes
    * Fix "Open in New Window" command (Issue#590).
    * Fix spurious "source file has been modified" (Jiří \ 
Techet, Issue#605,
      PR#621).
    * Don't open more than one document for non-existing paths from the CLI
      (https://bugs.launchpad.net/linuxmint/+bug/1482558, PR#646).
    * Fix configuration directory encoding on non-UTF-8 non-Windows systems
      (Dimitar Zhekov, PR#658).

    Interface
    * Use monospace font for the message window by default (Jiří Techet,
      Issue#435, PR#580).
    * Fix mnemonic conflict in "Use multi-line matching" (Ross Konsolebox,
      Issue#589, PR#647).

    Editor
    * Update Scintilla to version 3.6.1.
    * Fix completion popup height when view is zoomed (Issue#702).
    * Fix Go To End Of Display Line when wrapping is on and EOL are visible
      (Issue#712).
    * Keeping undo history when reloading files is now enabled by default
      (Thomas Martitz, Issue#562, PR#672).
    * "Strip trailing spaces", "Replace tabs" and \ 
"Replace spaces" now
      follow the current selection (Pavel Sountsov, PR#394).
    * Respect Smart Home Key setting in Go To Start of Display Line.
    * Check whether the document is newer on disk when the window gets
      focused (Jiří Techet, PR#533).

    Filetypes
    * Add Cargo build commands for Rust (Wayne Nilsen, PR#557).
    * Add recent Perl keywords (Olivier Duclos, PR#599).
    * Add missing Python 3 keywords and builtins (PR#755).
    * Improvements to the Rust filetype (Pavel Sountsov, PR#613).
    * Add multiline comment to Haskell (Abel Serrano Juste, PR#638).
    * Recognize `.adoc` is as Asciidoc (PR#708, PR#711).
    * Recognize `.mml` and `.mathml` as XML (Devyn Collier Johnson, PR#731).

    Internationalization
    * Updated translations: de, el, es, fr, hu, id, kk, pt, sk, sv, ru
    * Fix internationalization of "Open in New Window" items.

    API
    * New plugin API, `geany_load_module()`, `geany_plugin_register()`,
      `GEANY_PLUGIN_REGISTER()`, `geany_plugin_register_full()`,
      `GEANY_PLUGIN_REGISTER_FULL()` (Thomas Martitz, PR#469).
    * Add support for "proxy" plugins, `geany_plugin_register_proxy()`
      (Thomas Martitz, PR#629).
    * Allow `user_data` parameter and `destroy_notify` callback to
      keybindings with new `keybindings_set_item_full()` and
      `plugin_set_key_group_full()` (Thomas Martitz, PR#376).

    Windows
    * Restore modern design of native file dialogs (Issue#578).