dist: runtime/nvim.desktop

Closes #3689

cmake: Add `desktop-install` and `icon-install` targets. `runtime`
target will trigger them.

Specification:
https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#recognized-keys

Icons are stored system-wide in /usr/share/applications or user wide at
/usr/share/icons/hicolor/scalable/apps and can be overriden in ~/.local/share/icons

nvim.desktop file can be installed system wide or in
~/.local/share/applications/

To test without an installer:
$ xdg-desktop-menu install --novendor runtime/nvim.desktop
$ xdg-icon-resource install --novendor --mode user --size 64 contrib/nvim-icon.png

Once it is installed, you can test with gtk-launch if installed or
dmenu/rofi (drun mode)

4 files changed, 96 insertions, 1 deletions

diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
index cced1a8d04..69498dc1a1 100644
--- a/runtime/CMakeLists.txt
+++ b/runtime/CMakeLists.txt
@@ -100,6 +100,20 @@ add_custom_target(
     ${GENERATED_PACKAGE_TAGS}
 )
 
+# Optional targets for nvim.desktop file and icon.
+find_program(XDG_MENU_PRG xdg-desktop-menu)
+find_program(XDG_ICON_PRG xdg-icon-resource)
+if(XDG_MENU_PRG)
+  add_custom_target(desktop-file
+    COMMAND xdg-desktop-menu install --novendor ${PROJECT_SOURCE_DIR}/runtime/nvim.desktop)
+  # add_dependencies(runtime desktop-file)
+endif()
+if(XDG_ICON_PRG)
+  add_custom_target(desktop-icon
+    COMMAND xdg-icon-resource install --novendor --size 128 ${PROJECT_SOURCE_DIR}/runtime/nvim.png)
+  # add_dependencies(runtime desktop-icon)
+endif()
+
 # CMake is painful here.  It will create the destination using the user's
 # current umask, and we don't want that.  And we don't just want to install
 # the target directory, as it will mess with existing permissions.  So this
diff --git a/runtime/nvim.desktop b/runtime/nvim.desktop
new file mode 100644
index 0000000000..be6a2eda82
--- /dev/null
+++ b/runtime/nvim.desktop
@@ -0,0 +1,81 @@
+[Desktop Entry]
+Name=Neovim
+GenericName=Text Editor
+GenericName[de]=Texteditor
+Comment=Edit text files
+Comment[af]=Redigeer tekslêers
+Comment[am]=የጽሑፍ ፋይሎች ያስተካክሉ
+Comment[ar]=حرّر ملفات نصية
+Comment[az]=Mətn fayllarını redaktə edin
+Comment[be]=Рэдагаваньне тэкставых файлаў
+Comment[bg]=Редактиране на текстови файлове
+Comment[bn]=টেক্স্ট ফাইল এডিট করুন
+Comment[bs]=Izmijeni tekstualne datoteke
+Comment[ca]=Edita fitxers de text
+Comment[cs]=Úprava textových souborů
+Comment[cy]=Golygu ffeiliau testun
+Comment[da]=Redigér tekstfiler
+Comment[de]=Textdateien bearbeiten
+Comment[el]=Επεξεργασία αρχείων κειμένου
+Comment[en_CA]=Edit text files
+Comment[en_GB]=Edit text files
+Comment[es]=Edita archivos de texto
+Comment[et]=Redigeeri tekstifaile
+Comment[eu]=Editatu testu-fitxategiak
+Comment[fa]=ویرایش پرونده‌های متنی
+Comment[fi]=Muokkaa tekstitiedostoja
+Comment[fr]=Édite des fichiers texte
+Comment[ga]=Eagar comhad Téacs
+Comment[gu]=લખાણ ફાઇલોમાં ફેરફાર કરો
+Comment[he]=ערוך קבצי טקסט
+Comment[hi]=पाठ फ़ाइलें संपादित करें
+Comment[hr]=Uređivanje tekstualne datoteke
+Comment[hu]=Szövegfájlok szerkesztése
+Comment[id]=Edit file teks
+Comment[it]=Modifica file di testo
+Comment[ja]=テキストファイルを編集します
+Comment[kn]=ಪಠ್ಯ ಕಡತಗಳನ್ನು ಸಂಪಾದಿಸು
+Comment[ko]=텍스트 파일을 편집합니다
+Comment[lt]=Redaguoti tekstines bylas
+Comment[lv]=Rediģēt teksta failus
+Comment[mk]=Уреди текстуални фајлови
+Comment[ml]=വാചക രചനകള് തിരുത്തുക
+Comment[mn]=Текст файл боловсруулах
+Comment[mr]=गद्य फाइल संपादित करा
+Comment[ms]=Edit fail teks
+Comment[nb]=Rediger tekstfiler
+Comment[ne]=पाठ फाइललाई संशोधन गर्नुहोस्
+Comment[nl]=Tekstbestanden bewerken
+Comment[nn]=Rediger tekstfiler
+Comment[no]=Rediger tekstfiler
+Comment[or]=ପାଠ୍ଯ ଫାଇଲଗୁଡ଼ିକୁ ସମ୍ପାଦନ କରନ୍ତୁ
+Comment[pa]=ਪਾਠ ਫਾਇਲਾਂ ਸੰਪਾਦਨ
+Comment[pl]=Edytor plików tekstowych
+Comment[pt]=Editar ficheiros de texto
+Comment[pt_BR]=Edite arquivos de texto
+Comment[ro]=Editare fişiere text
+Comment[ru]=Редактор текстовых файлов
+Comment[sk]=Úprava textových súborov
+Comment[sl]=Urejanje datotek z besedili
+Comment[sq]=Përpuno files teksti
+Comment[sr]=Измени текстуалне датотеке
+Comment[sr@Latn]=Izmeni tekstualne datoteke
+Comment[sv]=Redigera textfiler
+Comment[ta]=உரை கோப்புகளை தொகுக்கவும்
+Comment[th]=แก้ไขแฟ้มข้อความ
+Comment[tk]=Metin faýllary editle
+Comment[tr]=Metin dosyalarını düzenle
+Comment[uk]=Редактор текстових файлів
+Comment[vi]=Soạn thảo tập tin văn bản
+Comment[wa]=Asspougnî des fitchîs tecses
+Comment[zh_CN]=编辑文本文件
+Comment[zh_TW]=編輯文字檔
+TryExec=nvim
+Exec=nvim %F
+Terminal=true
+Type=Application
+Keywords=Text;editor;
+Icon=nvim
+Categories=Utility;TextEditor;
+StartupNotify=false
+MimeType=text/english;text/plain;text/x-makefile;text/x-c++hdr;text/x-c++src;text/x-chdr;text/x-csrc;text/x-java;text/x-moc;text/x-pascal;text/x-tcl;text/x-tex;application/x-shellscript;text/x-c;text/x-c++;
diff --git a/runtime/nvim.png b/runtime/nvim.png
new file mode 100644
index 0000000000..dbc65ef363
--- /dev/null
+++ b/runtime/nvim.png
diff --git a/src/nvim/version.c b/src/nvim/version.c
index 9cf509ca23..a12621d06f 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -1537,7 +1537,7 @@ static int included_patches[] = {
   // 907 NA
   // 906 NA
   // 905 NA
-  // 904 NA
+  904,
   903,
   // 902 NA
   901,