all: implement staticcheck suggestions

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gesture/gesture.go

@@ -29,8 +29,6 @@ const doubleClickDuration = 200 * time.Millisecond
 // Click detects click gestures in the form
 // of ClickEvents.
 type Click struct {
-	// state tracks the gesture state.
-	state ClickState
 	// clickedAt is the timestamp at which
 	// the last click occurred.
 	clickedAt time.Duration

gpu/clip.go

@@ -6,7 +6,6 @@ import (
 )
 
 type quadSplitter struct {
-	verts   []byte
 	bounds  f32.Rectangle
 	contour uint32
 	d       *drawOps

internal/rendertest/bench_test.go

@@ -19,7 +19,7 @@ import (
 // use some global variables for benchmarking so as to not pollute
 // the reported allocs with allocations that we do not want to count.
 var (
-	c1, c2, c3    = make(chan op.CallOp, 0), make(chan op.CallOp, 0), make(chan op.CallOp, 0)
+	c1, c2, c3    = make(chan op.CallOp), make(chan op.CallOp), make(chan op.CallOp)
 	op1, op2, op3 op.Ops
 )
 

text/shaper.go

@@ -49,8 +49,7 @@ type faceCache struct {
 }
 
 func (c *Cache) lookup(font Font) *faceCache {
-	var f *faceCache
-	f = c.faceForStyle(font)
+	f := c.faceForStyle(font)
 	if f == nil {
 		font.Typeface = c.def
 		f = c.faceForStyle(font)

widget/material/loader.go

@@ -73,7 +73,6 @@ func clipLoader(ops *op.Ops, startAngle, endAngle, radius float64) {
 	// Use quadratic beziér curves to approximate a circle arc and
 	// minimize the error by capping the length of each curve segment.
 
-	const maxSegments = 20.
 	nsegments := math.Round(20 * math.Pi / (endAngle - startAngle))
 
 	θ := (endAngle - startAngle) / nsegments