README.adoc: more precise instructions

Without the compiled schemas, fiv doesn't launch at all.

.gitignore

@@ -1,3 +1,4 @@
+/.qtcreator
 /meson.build.user
 /subprojects/*
 !/subprojects/*.wrap

README.adoc

@@ -69,6 +69,11 @@ you can get a quick and dirty installation package for testing purposes using:
  $ meson compile deb
  # dpkg -i fiv-*.deb
 
+And in case you keep the default installation prefix rather than _/usr_,
+it is necessary to:
+
+ # glib-compile-schemas /usr/local/share/glib-2.0/schemas
+
 Windows
 ~~~~~~~
 'fiv' can be cross-compiled for Windows, provided that you install a bunch of

fiv-view.c

@@ -1506,7 +1506,7 @@ zoom_ask(FivView *self)
 	// For example, we would like to be flexible with decimal spaces.
 	GtkAdjustment *adjustment = gtk_adjustment_new(
 		self->scale * 100, 0., 100000., 1., 10., 0.);
-	GtkWidget *spin = gtk_spin_button_new(adjustment, 1., 0);
+	GtkWidget *spin = gtk_spin_button_new(adjustment, 1., 2);
 	gtk_spin_button_set_update_policy(
 		GTK_SPIN_BUTTON(spin), GTK_UPDATE_IF_VALID);
 	gtk_entry_set_activates_default(GTK_ENTRY(spin), TRUE);