[gedit] docs: write new roadmap

[Sébastien Wilmet <swilmet src gnome org>]

commit 0bd5ccc5a8ced9ec1d4a6ff494030c0feace07dc
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Aug 30 14:57:55 2019 +0200

    docs: write new roadmap

 docs/roadmap.md | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
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diff --git a/docs/roadmap.md b/docs/roadmap.md
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+gedit roadmap
+=============
+
+Make the gedit source code more re-usable
+-----------------------------------------
+
+**Status**: in progress.
+
+https://wiki.gnome.org/Apps/Gedit/ReusableCode
+
+Next steps:
+- Start to use the [Tepl](https://wiki.gnome.org/Projects/Tepl) library.
+
+Sébastien Wilmet
+
+Changing character encoding and line ending type of opened files
+----------------------------------------------------------------
+
+To fully support GtkFileChooserNative and better sandboxing.
+
+Note that the integrated file browser plugin needs access at least to the whole
+home directory. But the work on this task (with the code in Tepl) would allow
+better sandboxing for other text editors that don't have an integrated file
+browser.
+
+Handle problem with large files or files containing very long lines
+-------------------------------------------------------------------
+
+**Status**: in progress in Tepl.
+
+As a quick stopgap measure, prevent those files from being loaded in the first
+place, show an infobar with an error message.
+
+Longer-term solution: fix the performance problem in GTK for very long lines.
+
+For very big file size (e.g. a 1GB log file or SQL dump), it's more complicated
+because the whole file is loaded in memory. It needs another data structure
+implementation for the GtkTextView API.
+
+Sébastien Wilmet
+
+Do not allow incompatible plugins to be loaded
+----------------------------------------------
+
+There are currently no checks to see if a plugin is compatible with the gedit
+version. Currently enabling a plugin can make gedit to crash.
+
+Solution: include the gedit plugin API version in the directory names where
+plugins need to be installed. Better solution: see
+[this libpeas feature request](https://bugzilla.gnome.org/show_bug.cgi?id=642694#c15).
+
+Sébastien Wilmet
+
+Be able to quit the application with all documents saved, and restored on next start
+------------------------------------------------------------------------------------
+
+Like in Sublime Text. Even for unsaved and untitled files, be able to quit
+gedit, restart it later and come back to the state before with all tabs
+restored.
+
+Better C language support
+-------------------------
+
+Needed for more dog-fooding of gedit.
+
+- Code completion with Clang.
+- Align function parameters on the parenthesis (function definition /
+  function call).
+- Generate and insert GTK-Doc comment header for a function.
+- Split/join lines of a C comment with `*` at beginning of each line, ditto when
+  pressing Enter (insert `*` at the beginning of the new line).
+
+Sébastien Wilmet
+
+Improve printing UI workflow
+----------------------------
+
+Implement it like in Firefox, show first a preview of the file to print.
+
+Sébastien Wilmet
+
+Windows and Mac OS X support
+----------------------------
+
+To release new versions. And adapt/port the code if needed.
+
+### Windows
+
+**Status**: stalled
+
+Ignacio Casal Quinteiro
+
+### Mac OS X
+
+**Status**: stalled
+
+Jesse van den Kieboom