[DRC] Another workaround for KiCad lack of exclusions support in Python

- Saving the project can remove them, so `fill_zones` removed them

Fixes #250

CHANGELOG.md

@@ -16,7 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `--dont-stop` command line option, to try to continue even on errors (#209)
 - PDF/SVG PCB Print: option to print all pages/single page (#236)
 - iBoM: Support for variants that change component fields (#242)
-- Workaround for problems with DRC exclusions (See INTI-CMNB/KiAuto#26)
+- Workaround for problems with DRC exclusions (See INTI-CMNB/KiAuto#26, #250)
   Global option: `drc_exclusions_workaround`
   KiCad bug [11562](https://gitlab.com/kicad/code/kicad/-/issues/11562)
 - Internal BoM: KiCad 6 text variables expansion in the fields (#247)

kibot/gs.py

@@ -170,6 +170,18 @@ class GS(object):
         logger.debug("Current text variables: {}".format(GS.pro_variables))
         return GS.pro_variables
 
+    @staticmethod
+    def read_pro():
+        if GS.pro_file:
+            with open(GS.pro_file, 'rt') as f:
+                return f.read()
+
+    @staticmethod
+    def write_pro(prj):
+        if GS.pro_file and prj:
+            with open(GS.pro_file, 'wt') as f:
+                f.write(prj)
+
     @staticmethod
     def load_sch_title_block():
         if GS.sch_title is not None:

kibot/pre_fill_zones.py

@@ -24,4 +24,9 @@ class Fill_Zones(BasePreFlight):  # noqa: F821
         load_board()
         pcbnew.ZONE_FILLER(GS.board).Fill(GS.board.Zones())
         GS.make_bkp(GS.pcb_file)
+        # KiCad likes to write the project every time we save the PCB
+        # But KiCad doesn't read the exclusions, so they get lost
+        # As a workaround we restore the project, there is no need to change it
+        prj = GS.read_pro()
         GS.board.Save(GS.pcb_file)
+        GS.write_pro(prj)